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I figured the stock air box had a little bit of intake area, so I decided to increase this.

Take the air cleaner and top off, remove the coldstart vacume unit (in front of the 90 degee tube) and remove the air box with 2 10mm nuts closest to the engine, and 1 bolt in the side closest to the passenger fender...

Now, cut out peices on the side of the box(do NOT cut the bottom!), leaving enough for support and seal... this will in NO way let dirt in the carb, rather the cleaner might clog up 2000 miles early.

Doing this will increase the flow into the air cleaner by 1000%.

On my new samurai, along with replacing the Cat converter, I have gained close to 7 hp... The engine also accelerates 10x's faster.

yep, I have cut a hole in the back of the stock airbox (facing the firewall so no water can get in from tire spray etc) and it worked well. You just need to make sure that you do the right calculations on hole size so you dont mess up with the engines intake vs your exhaust size etc. If you do the wrong size on either end you can really mess up your vehicle performance.

I just cut out my whole exhaust, which had a clogged cat, and swiss cheese muffler. I put on a home fab 2 inch exhaust with an 18 inch glasspack (cherry bomb??). I can notice a big power difference. almost to the point of not being sure if I want to go through the headache of an engine swap. But for now, with the exhaust I have, how big of a hole should I cut into the airbox. I figured this could be something I could try until I put on the weber and snorkel.

VW guys have been drilling out their air boxes for years. I've adapted a "Cold Air Intake" from a Japanese car at the wreckers with a K&N knock-off to fit a 1.6. Noticeable increase in performace, and the exhaust sounds a lot "throatier" than stock.

__________________
Bubbles: Do you want to see a rocket go, Randy?
Randy: Does it really launch, Bubbles?
Bubbles: Does it really launch? Does the tin man have a sheet metal cock?

I will admit, not all was the air box. I've done a bunch of things sence I got it, but the ones I can think of bettering the 1/4 mile is; the Cherry Bomb, Cat bypass, 2/3's the the exhaust is 2 1/2" piping, about 70 pounds weight reduction. Just to name a few.

I love the sound the most... If I could afford it, I would go with the cold air intake... But I just look for the cheap upgrades.

Putting a snokel and a drop-in K&N filter into my 16v Sidekick made a noticeable difference. On hills where the transmission's torque converter would unlock, it now stays locked. On hills where the transmission used to downshift to 3rd, it now stays in 4th.

But this isn't a free or quick horsepower gain. The snorkel isn't cheap, and you have to cut a fat hole in your fender. But the ram-air effect is no joke and will get you a little bit of a power gain. But not 3 seconds in the 1/4-mile.

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